"The referee and the corner should be investigated and shouldn't be allowed to be in the sport of boxing, because we've got to first and foremost look after our fighter," Fenech told AAP.

Fenech, who was in the corner of undercard fighter Brock Jarvis, was critical of Horn's trainer Glenn Rushton.

Rushton admitted to being torn between intervening and giving Horn the chance to rally as he did in 2017, when he weathered a ferocious onslaught in his famous win over Filipino legend Manny Pacquiao in Brisbane.

Fenech was happy with the performance in Bendigo of Javaris, the highly rated 21-year-old super bantamweight who confirmed his potential with a strong points win over former world title contender Ernesto Saulong.

Prior to Saturday, Jarvis had only racked up 29 rounds in his 16 previous fights, just one of which went the distance.

Jeff Horn was left to rue his ninth-round luck against Michael Zerafa.Image: Getty

The fast-punching Sydneysider looks certain to improve his IBF rating of 15, but Mother Nature may eventually force him to campaign in a higher division.

Fenech said Jarvis grew 4.5 centimetres in six months and only just made the super bantamweight limit a few minutes before Friday's weigh in.